pgsql: Reconcile nodes/*funcs.c with recent work.

Reconcile nodes/*funcs.c with recent work.

A few of the discrepancies had semantic significance, but I did not
track down the resulting user-visible bugs, if any. Back-patch to 9.5,
where all but one discrepancy appeared. The _equalCreateEventTrigStmt()
situation dates to 9.3 but does not affect semantics.

catversion bump due to readfuncs.c field order changes.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/b8fe12a83622b350dc6849f8bb933bd8a86c1424

Modified Files
--------------
src/backend/nodes/copyfuncs.c | 5 +++--
src/backend/nodes/equalfuncs.c | 6 +++---
src/backend/nodes/outfuncs.c | 8 +++++---
src/backend/nodes/readfuncs.c | 4 ++--
src/include/catalog/catversion.h | 2 +-
5 files changed, 14 insertions(+), 11 deletions(-)